GE AKD-20 AR Installation And Maintenance Manual page 33

DEH-41473
Neutral Bus Interconnections (Optional)
The neutral bus is insulated from the grounded frame of the
switchgear equipment; thus, it is mounted on insulators
throughout the equipment. Installation of the neutral bus
splice plate across a shipping split is similar to the ground bar
splice except that the splice plate is not bolted to the
equipment frame. Figure 4.10 illustrates the installation of the
neutral splice plate.
The neutral bus may be located either in the lower position or
the upper position on the rear upright channels.
A neutral bus may be provided for 4-wire electrical systems.
The neutral bus may or may not extend the length of the
equipment construction. Consult the factory drawings for
details.
Horizontal Main Bus
The installation of the horizontal bus splice bars is with bolted
joints.
Figure 4.11 and Figure 4.12 illustrate the assembly of the
main bus splice plates on the bolted bus system. Copper bus
systems are normally supplied with flat washers and lock
washers.
Figure 4.11 shows the rear view of the main bus area with the
installed splice plates indicated with cross-hatching.
Figure 4.12 shows that a spacer is used both between the bus
bars when more than one bar is used per phase (normally the
2,500 ampere and larger main bus ratings).
The factory drawings provided with the equipment will detail
the assembly for each main bus rating.
After assembly of the splice bars and spacers, the 1/2-13
bolts should be tightened to a torque of 35-40 ft.-lbs.
After completing the installation of the main bus splice bars,
the joint covers may be mounted and secured by a 3/8-16
nylon bolt and polyester flat washer if the bus insulation
option has been supplied with the equipment.
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Courtesy of NationalSwitchgear.com
AKD-20 AR / Entellisys AR Low-voltage Switchgear
Figure 4.10 Neutral bus splice installation (plan view)
Figure 4.11 Main bus at shipping split (rear view)
Figure 4.12 Horizontal bus splice installation (plan view)
Section 4. Equipment Installation
28